题目

某电动机线圈的电阻为R，正常工作时两端的电压为U，通过的电流为I，则该电动机工作时，输出的最大机械功率为 （ ） A．UIB．I2RC．UI＋I2RD．UI－I2R 答案：：D解析:：电动机是非纯电阻电路，电路消耗的电能转化为机械能和内能，所以输出的最大机械功率为UI－I2R阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。注意：每个空格只填一个单词。If we agree that the function of education is to prepare us for life, then there is very little time to waste. So, while we can, we ought to concentrate on teaching children something really useful. Here is what our schools should teach.Politeness is a mark of civilization. The sooner children learn this, the better. In any case, a lot can be accomplished by a smile and good manners.Like it or not, our adult lives will be consumed by the struggle for money, but we don’t make an effort to teach children how to manage it. So our schools have a duty to teach them this ability from the beginning.We’re likely to accept something we are told, but that’s not what educated people do. Educated people are reasonable and they look at facts. If our schools teach nothing else, they should at least teach critical (批判性的) thinking.Children should learn to take care of their health. They should know that if they eat junk food (垃圾食品), they will become fat and unhealthy. They should be very clear about what happens to their bodies when they drink or smoke.All of us are part of society. We have rights and responsibilities. We ought to understand what they are. We have to know a little bit of our history and geography, because we need to have an environment in which to relate to the people around us.How will we test students on these? We can’t. But that’s not a reason to avoid teaching what is important. Our schools should spend every moment they have telling this to our children: “This is life, this is what you are going to face, and this is how you deal with it.”TitleVery Useful【1】 IntroductionEducation should be a 【2】 for life.AdviceImportant things should be taught in 【3】 Teaching【4】 ●How to behave【5】 ●The basic skill of【6】 money●How to【7】 in a critical way●How to keep【8】 ●The rights and responsibilities one has in 【9】 ConclusionChildren should be taught what 【10】 is and how to deal with it.